How can they put their hands in front of it without being burned?
Edit: Nevermind, they must be avoiding the focal point...but when he taps the bottle, it looks pretty close.
English
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The glass is on a swivel, so he can rotate it so that the focal point is not near the concrete and put things on the block [i]"safely"[/i], in the loosest possible sense of the word.
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My guess is that it's a small spot and he just adjusts the screen to actually focus it where he puts stuff.